RF safety concerns have been raised for both the
mother and the fetus for 3 T fetal MRI. Parallel transmission can address these
concerns by reducing the maternal and fetal SAR however it also relies on one
or more body models to predict that individual’s local SAR. In this work, we
assess the range of error incurred when various pregnant or non-pregnant models
are used to predict SAR in pregnant patients. We model the degree of over or
underestimation of SAR in 56 combinations of model/patient and find a maximum
SAR under/over-estimation of 59%/142%.

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